package com.manong.config.security.handler;

import com.alibaba.fastjson.JSON;

import com.alibaba.fastjson.serializer.SerializerFeature;
import com.manong.config.redis.RedisService;
import com.manong.entity.User;
import com.manong.utils.JwtUtils;
import com.manong.utils.LoginResult;
import com.manong.utils.ResultCode;
import io.jsonwebtoken.Jwts;
import org.springframework.security.core.Authentication;
import
  org.springframework.security.web.authentication.AuthenticationSuccessHandler;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.nio.charset.StandardCharsets;

/**
 * 登录认证成功处理器类
 */
@Component
public class LoginSuccessHandler implements AuthenticationSuccessHandler {
  
  @Resource
  private JwtUtils jwtUtils;
  
  @Resource
  private RedisService redisService;
  
  @Override
  public void onAuthenticationSuccess(HttpServletRequest request,
                                      HttpServletResponse response, Authentication authentication)
    throws IOException, ServletException {


//设置客户端的响应的内容类型
    response.setContentType("application/json;charset=UTF-8");
//获取当登录用户信息
    User user = (User) authentication.getPrincipal();
    
    //生成token
    String token = jwtUtils.generateToken(user);
//设置token签名密钥及过期时间
    long expireTime = Jwts.parser() //获取DefaultJwtParser对象
      .setSigningKey(jwtUtils.getSecret()) //设置签名的密钥
      .parseClaimsJws(token.replace("jwt_", ""))
      .getBody().getExpiration().getTime();//获取token过期时间
//创建登录结果对象
    LoginResult loginResult = new LoginResult(user.getId(),
      ResultCode.SUCCESS, token, expireTime);

//消除循环引用,将对象转换为JSON格式
    String result = JSON.toJSONString(loginResult,
      SerializerFeature.DisableCircularReferenceDetect);
//获取输出流
    ServletOutputStream outputStream = response.getOutputStream();
    outputStream.write(result.getBytes(StandardCharsets.UTF_8));
    outputStream.flush();
    outputStream.close();
    
    //将token信息保存到Redis中
    String tokenKey = "token_"+token;
    redisService.set(tokenKey,token,jwtUtils.getExpiration() / 1000);
  }
}

